diff --git a/libraries/rte/rte_routines.lib.php b/libraries/rte/rte_routines.lib.php
index 3c1714b4f7..7bc516ecf8 100644
--- a/libraries/rte/rte_routines.lib.php
+++ b/libraries/rte/rte_routines.lib.php
@@ -350,6 +350,7 @@ function PMA_RTN_handleEditor()
             );
             $message = PMA_message::error($message);
             if ($GLOBALS['is_ajax_request']) {
+                $response = PMA_Response::getInstance();
                 $response->isSuccess(false);
                 $response->addJSON('message', $message);
                 exit;